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i965/fs: Optimize saturating SEL.L(E) with imm val >= 1.0. 

total instructions in shared programs: 1409124 -> 1406971 (-0.15%)
instructions in affected programs:     158376 -> 156223 (-1.36%)

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
This commit is contained in:
Matt Turner 2013-10-27 20:03:48 -07:00
parent a8f76d829b
commit ca675b73d3
1 changed files with 22 additions and 0 deletions
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22
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -1880,6 +1880,28 @@ fs_visitor::opt_algebraic()
break;
}
break;
case BRW_OPCODE_SEL:
if (inst->saturate && inst->src[1].file == IMM) {
switch (inst->conditional_mod) {
case BRW_CONDITIONAL_LE:
case BRW_CONDITIONAL_L:
switch (inst->src[1].type) {
case BRW_REGISTER_TYPE_F:
if (inst->src[1].imm.f >= 1.0f) {
inst->opcode = BRW_OPCODE_MOV;
inst->src[1] = reg_undef;
progress = true;
}
break;
default:
break;
}
break;
default:
break;
}
}
break;
default:
break;
}